Is Commercial RE Overvalued?

Maybe I'm too poor to ask but RE around me went from farm land to $60K/acre around 2005 to $20K/acre a few years ago. Now a house down the street is $200k/acre (10 acres). It says its been rezoned commercial and it is on a heavily used road which will probably be widened in next 20 years.... but is commercial RE over-valued? Or do you just need to be a multi-millionaire to open a business.